Chemical Engineering Thermodynamics

For an exothermic reaction

  • A. Only enthalpy change (ΔH) is negative
  • B. Only internal energy change (ΔE) is negative
  • C. Both ΔH and ΔE are negative
  • D. Enthalpy change is zero
Answer: Option C.

During exothermic reaction since the heat is given out by the system the thermal energy decreases and therefore the internal energy decreases leading to a decrease in enthalpy.

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